Kneading and mixing machine



Aug. 20, 1935. F. AEscHBAcH 2,012,214

KNEADING AND MIXING MACHINE Filed July 21, 1935 5 Sheets-Sheet 1 Aug. 20, 1935.

F. AESCHBACH 2,012,214

KNEADIN AND MIXING MACHINE 'Filed July 21, 1953 3 Sheets-Sheet 2 Aug. 20, 1935. F. AESCHBACH KNEADING AND MIXING MACHINE Filed July 21, 1933 3 Sheets-Sheet 3 IIIZIZFQ'ZZOP Patented Aug. 20, 1935 1 2,012,214 'LKNEADING ,ANDVMIXING MACHINE Friedrich Aeschbach, Aarau, Switzerland Application July 21, 1933, Serial No. 681,635

' In Switzerland August 2, 1932 U v Claims. (01.259-84) This invention relates to kneading and mixing; this purpose the standards l are provided. with machines comprising a rotatable trough and relaupper bearing-portionsfor receiving the. journals tively movable implements cooperating with the t, G of the trough which are lining up on the UNITED T ES rjNr OFFIQE trough. tilting axis B of the trough. r With machines of this type it is known to dis For effecting the tilting, on the journal 4a f5 pose one of the implement shafts in oblique relatoothed sector 35 is arranged which meshes with tionship tothe axis of rotation of the trough. a pinion 6 on a spindle the other end of which According to the present invention the kneadcarries a'fspider 'l'for hand operation and which ing and'mixingeffect of the machine is substanis mounted in one of the standards of the ma- 10 tially improved by providing two implements the chine. 'A ratchet wheel fi rigid; with the spindle l0 actuating shafts-of which aresituated in one and of the spider and cooperating with a pawl "9 the same planethrough the'axis of rotation of permits of adjusting thetroughlinto different; the trough and are inclined to point substantially tilting'positions, whereof the one shown in-Fig. i

.towards the middleof the-bottom of the trough, permits of completely emptying the'trough. l

to the generatrixof the'body produced in revosymmetrically inclined relationship to the axis lution forming the trough and the paths of moveof rotation A of the trough and so that the im- 1 ment caused to intersectabove the axis of rotaplement shafts are disposed on opposite "sides of tion of thet'roiigh'. V r I the axis A' in such a relative disposition that their Advantageously the two implements are driven axes extendapproximately from the upper edge 20 r at the same number of revolutions but in oppoof the trough towards the middle of the bottom site directions. i V of the-same. In this manner the implements ll, 7 'Due to thev increased eflic'iency this machine which are both formed in a closed ring and the more quickly initiates the dough formation in outer circumference of which conforms to' the the material, in consequence whereof the c'apaportion of the interior trough wall" which the 25 bilityof the dough to assimilate'water' is 'subimplements are facing, assume a correspondingly stantially increased'in comparison to'the effect inclined position to be adapted to operate approduced in thedough by the known machinesh proximately within half the working space of Alternativelythe implements maybe driven the'trough duringthe rotation about-their axes in oppositedirections at a different number of and the simultaneous rotation of the trough .30

revolutions. By this means the kneading and about its axis A. The paths through which the mixing effect of the machine is still further imimplementsmove intersect above in the axis of proved as compared with machines in which the rotation of the trough. implements are driven at an equal number of Motion is imparted to the impl'ementshafts I0 revolutions. v by an electromotor l2, secured to the lower part In the accompanying drawings two construcof the frame 3, by means of a belt drive l3, i3, tional formsof the invention are shown by Way which is enclosed in a casing 14, and by means of example only, in which n of a worm shaft 15. The latter is mounted in Fig. 1 is a front elevation partly in section of theupper part of the frame 3 and cooperates by v and theshape of th'eimplements being adapted The two implement shafts Iii are arranged in 4.0 the machine, 7 means of worms it, [6 with spur gear wheels [1, 40

Fig. 2 shows a plan view of Fig. 1, 7 ll acting in the' manner of worm wheels and Fig. 3 shows a side elevation of the machine; carried by the respective implement shaft IE3. Fig. 4 is a rear view of Fig. 3 showing the Both implement shafts .run at the same speed trough in tilted position. which is adapted to be adjusted into two'sta'ges 4.5 Fig. 5 illustrates a cross section of the trough. correspondingly to the difference in diameter of with a modified form of one of the implements, the pulleys l3, l3 mounted'on the worm shaft and I i5, by means of a shift-key controlled coupling Fig. 6 shows a front-elevation partly in section arrangement it, so that by connecting one or the of a second constructional form of the invention, other pulley, to the worm shaft the ratio of gear and V ing of the belt drive is changed. 50

Fig. 7 is a plan view of Fig. 6. The drive of the trough 2'is derived from the I denotes two machine standardsarranged on end of the worm shaft l5 remote from the belt either side of the trough 2 and adapted for cardrive l3, l3, by means of a'chain drive l9 acting rying a hollow tiltable frame 53 in which the on a worm shaft 26 mounted in the lower part of 55/ trough is rotatably mounted about its axis A. For the frame 3. This shaft transmits the move 5 ment of the shaft of the motor I 2 to a lower pivot pin 2| of the trough which is situated in the axis of rotation of the latter, by means of a worm drive 22, 23.

The chain drive l9, worm shaft 29, and worm wheel 23 are encased for safeguarding the persons attending the machine, by the first mentioned two parts being housed in the hollow frame 3 and the wheel 23rincluded in a separate casing 24. I

In the operation of the machine, during the relative movements of the implements with their axes obliquely disposed to each other, a move ment of the whole mass contained in the trough in the vertical direction sets in. In the beginning of the working of the material the kneading implements are run at high speed byrendering the belt drive it operative, whereby the dough formation in the material sets in quickly. After the dough formation is initiated the belt drive 13 is rendered operative, thus reducing the speed of the implements which owing to their inclined disposition draw out the dough in a very effective manner similar to the Working of the dough by hand.

Fig. 5 shows a variant construction in which one of the implements is replaced by a semiringshaped implement ll which cooperates with an annular implement H. .A further modification may consist in the arrangement of two cooperative semi-ring-shaped implements H. Alternatively, depending on the special purpose which the machine is to serve for working different kinds of materials, implements of still other forms may be employed.

The machine described is distinguished by a high efiiciency, simplicity of design and low costs of manufacture.

The second constructional form of the invention, as shown in the Figs. 6 and 7, corresponds to the embodiment described above in all principal parts except that the two implements H are driven at different rotative speeds. This is accomplished by providing different'diameters for the spur gear wheels I! and Ha meshing with the worms [6 and 16 respectively. The relation between the ratios of gearing of the worm drives I6, I! and I6, Ha cannot be chosen entirely at will. In choosing this relation the particular shape of the implements must be taken into consideration in order to avoid that the rotating implements interfere with each other.

I do not limit myself to the particular size, shape, number or arrangement of parts as shown and described, all of which may be varied without going beyond the scope of my invention as shown, described and claimed.

What I claim is:

1. In a stirring, mixing and kneading machine, in combination, a trough for the material rotatably arranged about a central vertical axis and having a dish-shaped inner wall concentrically disposed with-said central axis, two individually rotatable implement shafts situated on diametrically opposite sides of said trough and directed from the edge of said trough substantially towards the middle of the bottom of the same, two implements secured to said shafts and extending at leastwith one arm into scraping contact with said inner trough'wall and with their paths of movement intercrossing each other in the region of said trough situated about said central axis, and means for rotating said implement shafts in opposite directions in coordinated timed relationship, the upper parts of the paths of the implements being toward the center of the trough, whereby the implements tend to carry the material from the periphery of the trough into the region of the troughin which the paths of the implements cross. q

2. In a stirring, mixing and kneading machine, in combination, a trough for the material rotatably arranged about a central vertical axis and having a dish-shaped inner wall concentrically disposed with said central'axis, two individually rotatable implement shafts situated on diametrically opposite sides of said trough and directed from the edge of said trough substantially towards the middle of the bottom of the same, two implements secured to said shafts and extending at least with one arm into scraping contact with said inner trough wall and with-their paths of movement intercrossing each other in the region of said trough situated about said central axis, and means for rotating one of said implement shafts twice as fast as the other implement shaft in the opposite direction to the latter.

' FRIEDRICH AESCHBACH. 

